光脱塩素と生物分解のハイブリッド法によるPCB処理法

概要

論文の詳細を見る
Polychlorinated biphenyls (PCBs) are widespread environmental pollutants. Although microbiological PCB degradation has been studied for a few decades, it has not been applied for a large-scale disposal of concentrated PCBs. We had developed a method combining photodechlorination and biological degradation for the complete decomposition of PCBs. Here we examine a pilot scale study on the degradation of commercial PCBs from a high voltage transformer. After optimizing the culture conditions, over 99.9999% of 1300-1800g of Kaneclor 1000 was degraded within 8 d. Mass balance study showed undesirable by-products such as polymerized PCBs were not produced. Dioxins including dibenzofran and co-planar PCBs in Kaneclor sample were also degraded completely by UV dechlorination and biodegradation. The concentration of PCBs in the final effluent was acceptable by the Japanese standard (0.003 mg/l) on wastewater. Based on the above results, we have demonstrated that biological degradation combined with UV dechlorination is a useful method for the safe disposal of PCBs.
社団法人日本生物工学会の論文
2004-02-25